Hydraulic coupling and change-speed gear



ml u Q G m w a Q Aug. 5 r1924.

HYDRAULIC COUPLING Am) CHANGE SPEED GEAR Filed Semi. 15, 1922- 2 Shams-Sheet l Aug. 5 mm,

3,503,618 5. c. WINGQUlST HQDRAULIC COUPLING AND CHANGE SPEED GEAR Filed ept} 1 1922 2 Sheets-Sheet 2 drawing accompanying and forming a Fetent Aug. 5, i924.

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SVEN GUSTAF WINGQUIS'E, 0F GOT'IEIQ'BORG, SWEDEN.

HYDRAULIC CQUPLING AND CHANGE SFEED GEAR.

Application filed September is, 1922. Serial m. assess.

' plings and change speed gears consisting of one Or more pump elements or s stems of pump elements, and provided wit 1 control lin means by the adjustment o't which the di erent steps of coupling may be obtained. The object of the invention is to pcnform the said steps of coupling automatically.

The invention consists, chiefly, in this that the said controllinlg-meansare acted on, .directly, by the fluid pressure existing in the pressure chamber of the gear, so that the steps of coupling will be dependent on the pressure existing in the said chamber, 1. e., on the turning moment of the driven part of the gear.

Further, the controlling means may, preferably, be arranged in such manner so as to be moved, below a certain pressure in the pressure chamber, through the action of springs or the like, back to the position, in which a. direct drive exists between the driv ing and the driven part of the gear, the so called position of rest.

Further, in case of the gear being carried out for a number of transmission ratios the controlling means are arranged in such manner so as to be active at different pressures,

so that the transmission ratio. will increase,

successively, with the pressure.

In the drawings annexed hereto, .wherein I have shown two embodiments of a hydraulic coupling and change speed gear according to this invention; Fig. 1 IS an axial section of the gear. Fig. 2 is a transverse view of the delivery pump, taken along the line 22 of Fig. 1 in the direction of the arrows.

In the form of embodiment showninFi 1 to t, which consists of two pumps of t e ordinary shdin vane type, 1 designates a driving shaft w 1011 is rigidly secured to an outer casing 2 which constitutes the driving rotor of the change speed gear. Rotatabl mounted in the said casing is a driven sha 3 to which is rigidly connected a rotor 5 rovided with radially movable vanes 4 w ich together constitute the driven rotor of the gear. Mounted in the casing 2 is, further, a

stator 7 provided with radially movable vanes 6 and which is, in the form of embodimerit-shown, keyed to a sleeve-like projection 8 of a frame 9. The projection 8 also serves as a ournal for the rotary casing 2.

The pump 2, 5 as herein disclosed may be considered the delivery pump of the device and the pump 2, 7 the receiving pump, the

'former having an abutment 14c and working face 16 and the latter an abutment 15 and a working face 17. Between the two pumps is a partition Wall 10 which is carried by the rotor casing 2 and as herein shown is integral therewith. Within the partition is a valve chamber in which is positioned a pistonv valve 12 controlled by a helical sprln 13, said valve governing the passages 11 and 19, the former being adapted to establish communication between the pressure chamber 20 and suction chamber 21 of the pum 2, 7, and the latter adapted to establish communication between the pressure chamber 18 of the pump 2, 5 and the pressure chamber 20 of the pump 2, 7. There is also provided a passage 22 which connects with the suction chambers 21' and 23 respectively of the pumps 2, 7 and 2, 5 and thus provides for a circulation of the fluid during the op eration of the device.

The operation of the device is as follows: Supposing the driving shaft 1 with the housing 2 to be rotated in the direction of the arrow, shown in F 2 and 3, and supposing further the driven shaft 3 carrying the rotor 5 with the vanes 4 to be exposed to a load, there will arise a pressure in the chamber 18 of the delivery pump 2, 5 between the abutment 14 and the adjacent vane 4. Supposing, further, the pressure controlled valve 12 to shut off the pressure channel 19 between the delivery pump 2, 5

and the receiving pump 2, 7, as shown in Fig. 1, the fluid contained in the said chamber 18 will be entirely trapped, and the rotor 5 with the shaft 3 will be rotated with the same speed and in the some direction as the:

pressure'and suction chambers of the reoeiving pump If, then, the load to be driven be increased, also the pressure in the pressure chamber. 18 of the delivery pump 2, 5 increases. A; at

certain value said pressure overcomes the tension of the spring 13 end moves the valve 12 towards the right in Fig. 1, the pressure channel 19 between the two pumps 2, 5 and 2, 7 being in this case opened, end simultn neously, the conduit 11 in the abutment- 15 or the receiving pump 2, 7 will be closed, no apparent frornlfig. 4-. Thus, part of he fluid of the delivery pump 2, 5. will he admitted through the channel 19 to the chamber 20 of the receiving pump 2,7 causing a corresponding sli oi the'driven rotor 5 with relation to the iving rotor 2 and causing also or pressure in the chamber '20 of the receiving pump 2, Z.

' As the stator 7 cannot move u. reaction force due to said pressure will be exerted on the abutment 15, i. e, on thetside of the shut ment, which confines the one endo'i said chamber 20, end the said reaction force will be transmitted throu h the rotorbody 2 to the abutment 14 of t e-dclivery pump 2, 5 end itrom there through the fluid in the chamber 18 to the vanes or the/driven rotor 5, thereby causing-on increased torque of Enid rotor corresponding to its slip, i. e., to on transmission ratio, which depends in knownmenner on the relation between the olumetric capacities of the two pumps 2, .5 and 2, 7. Thefluid in the pump 2,7 escapes at 21 ;:l ai1d 2, to the suction chamber 23 of th delivery-pump 2, 5, a circulation of the "fiuidjtaking place between the tivo pumps,it

rbeing understood that the interior of the -dov1 ce=is entirely filled with fiuid-(prefer- --l irhcn ngein shuttin off the connection 19 between the two pumps, which will occur 1 to 4 in this respect only that asccond ceiving pump has been added, comprising a stator body 2%. having"v radially movable runes 25 and cooperating with an alnitiiuent end a; Working surface formed in thecommon rotor 2 in the some manner as described with reference to Fig. 3. Leading between receiving puin nlligs. 1 and 3, through the channel 22,.

ing'pumps, said pumps being 1 the delivery pump 2, 5 and the sitid second 2, 24 there is a. pressure channel 26, Fig.6, controlled by s sepe'rete pressure actuated valve 2?, Fig. 5-, there be ing a. conduit 28, similar to the conduit 11 in the former case, in the abutment between the pressure chamber end the suction chan1-.

ber of the pump 2, 24;, said conduit 28 being controlled by the pressure actuated valve 27 in thc'sume manner as is the conduit 11 controlled by the valve 12. r The diil eicnce as to the action of this gear nndtliat according to Figs, 1 to econsists in this thet,'?it the valve 12 opens the channel 19 between the delivery pump 2, 5 and the first receiving pump 2, 7 at a. certain fluid pressure, i. e, at a certain load,-the valve 27 will open the channel; 2'5 between the. delivery pump- 2, 5 end'the second receiving pump 2, '24: at a. certain higher pressure, thereby producing a second transmission retio.

in this case, the fluid escapes at 29, Fig. 5,

through'the chamber 21 of the first receiving pump 2, '7 and through the channel 22 to the suction chamber 23 of the delivery pump 2, 5, u circulation of the fluid taking place between said last mentioned pump 2, .3

end the receiving pumps 2, 7 end 2,24.

While I have herein shown and descr bed two embodiments of my invention, it will be understood that various changes maybe made therein without departing from the, spirit of the invention.

1 claim: l, A hydruulic coupling and change speed peer, compris ng a delivery pump and at cost one receiving pump, a connection between said delivery 'pumpand said receiving pump, seidpumps being formed by a driving rotor, a, driven rotorand nstator, one of said rotors being common to all said pumps a valve disposed in the. said connection and controlled by the fluid pressure set up in said delivery pump to open said, connection.

2, A. hydraulic coupling end chengespeed gear, compris ng a delivery pump and at least one receiving pump, a connection between said delii cry pump and said-receiving 1 pump, said pumps being formed by a driving rotor, u driven rotor and a stator, one of said rotors being common to all said pumps, n spring" actuated valve disposed in the said connection and controlled by the fluid pressure set up in said-delivery pump to open said connection and counteract the force of said spring.

3. A hydraulic coupling and chunse speed gear, comprisingn delivery pump and uplurulity of rocelvlng' pumps, and connections between. said delivery pump an eid receivdriving rotor, n driven-rotor and u stator,

...med by a v memes between the delivery pump and the several receiving pumps and controlled by the fluidpressure set up in said delivery pump to sue cessively open the said connections at different fluid pressures.

4. A hydraulic coupling and change speed gear, comprising a delivery pump and a Plus rality of receiving pumps, and connections between said delivery pump and said receivbetween the delivery pump and the lurelity of receiving pumps we controlled by the fiuid'pressure set up in seid delivery pump 10 suceessivel open the said connections as different fiui pressures, and springs edapted to successively close said valves, as the fluid pressure drops. 5. A hydraulic cougliling and change speed gear according to c eiml, in which pumps are of the slidio. verse type. In tesfiimony Whereo' l lzeve signed, my

name.

EVEN GllfiTAF WiNGlQ-UIST.

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